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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd927c00463871b0f37b25c3b922de5d3f7af2a5f58002cabc711cf5ae375fecb' 
  AND token = 'Ux4IlwtHkLjYBWW67c+IcbpBJlC1YaZEufVIalaP0mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}